646769538776 has 16 divisors (see below), whose sum is σ = 1213238930640. Its totient is φ = 323239157280.

The previous prime is 646769538769. The next prime is 646769538791. The reversal of 646769538776 is 677835967646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18182636 + ... + 18218171.

It is an arithmetic number, because the mean of its divisors is an integer number (75827433165).

Almost surely, 2^646769538776 is an apocalyptic number.

It is an amenable number.

646769538776 is a deficient number, since it is larger than the sum of its proper divisors (566469391864).

646769538776 is a wasteful number, since it uses less digits than its factorization.

646769538776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36403034 (or 36403030 counting only the distinct ones).

The product of its digits is 1920360960, while the sum is 74.

The spelling of 646769538776 in words is "six hundred forty-six billion, seven hundred sixty-nine million, five hundred thirty-eight thousand, seven hundred seventy-six".